Promising Versions of alpha-Martensite Rod-Like Crystal Initiation in Iron Alloys by Three Elastic Wave Sources

Abstract

Versions are provided for alpha-martensite rod-shaped crystal initiation by three orthogonal longitudinal elastic waves propagating in orthogonal directions of the types aOE (c) 001 >(gamma) and aOE (c) 110 >(gamma) in Fe - 31% Ni single crystals. The probability is considered of direct initiation by Bain-type deformation waves. It is demonstrated within the scope of dynamic theory that the anticipated orientation of rod-like crystals is close to aOE (c) 111 >(gamma) or to aOE (c) 905 >(gamma). Possible features of martensite crystal tetragonality are discussed. Ultrasound source power required for initiating martensitic transformation is determined.